The worldwide succinylation and protein abundance in SARS-CoV-2–contaminated cells

In a latest examine revealed in Proceedings of the National Academy of Sciences (PNAS), researchers assessed the worldwide succinylation of extreme acute respiratory syndrome coronavirus 2 (SARS-CoV-2)-infected host cells. 

Study: The global succinylation of SARS-CoV-2–infected host cells reveals drug targets. Image Credit: Jezper/Shutterstock
Examine: The global succinylation of SARS-CoV-2–infected host cells reveals drug targets. Picture Credit score: Jezper/Shutterstock


Whereas coronavirus illness 2019 (COVID-19) vaccines have performed a vital function in curbing SARS-CoV-2 transmission, the waning effectiveness of the vaccine in opposition to novel viral variants has turn into a topic of grave concern. This has necessitated the event of broad-spectrum and efficient ant-viral medicine in opposition to SARS-CoV-2 and its rising variants.

In regards to the examine

Within the current examine, researchers investigated the succinylation of host and SARS-CoV-2 proteins through succinylproteomics evaluation primarily based on quantitative mass spectrometry.

The crew analyzed the impact of SARS-CoV-2 an infection on host protein post-translational modifications (PTMs) within the early phases of an infection by figuring out the viral an infection situations in Caco-2 cells. The general profiles associated to the 5 kinds of PTM have been examined after SARS-CoV-2 an infection, reminiscent of acetylation, lactoylation, malonylation, succinylation, and ubiquitination. Moreover, the crew harvested Caco-2 cells in organic triplicate samples at zero, 12, and 24 hours post-infection (hpi). Every pattern was assessed for variations within the international protein abundance, transcription, or succinylation. The an infection group analyzed at zero hpi was employed in all of the comparisons to estimate the fold-changes comparable to genes or proteins.  

The likelihood of interference of non-succinylated proteins was eradicated by evaluating the fold-changes noticed in succinylated proteins and whole proteins in abundance. Moreover, the interpretation sample of the SARS-CoV-2 proteins was detected by the evaluation of the abundance of viral transcriptome and proteome noticed at various time factors. 


The examine outcomes confirmed that protein succinylation was considerably upregulated within the early phases of SARS-CoV-2 an infection, which was positively related to the interval of an infection. The crew additionally noticed that the variety of host proteins lowered in abundance within the later phases of an infection. Moreover, the proportion of the succinylated websites and proteins additionally elevated, indicating that the viral an infection elicited a response from the host succinylated proteins.

The crew categorised the host succinylated proteins into 4 teams primarily based on the fold-changes in abundance. This revealed that a number of succinylated proteins have been current within the second cluster, indicating that the host protein succinylation ranges have been positively related to the method of viral an infection. This optimistic correlation was additional verified by a deeper evaluation of the 9 teams of protein abundance in addition to succinyl protein abundance in the course of the an infection. Moreover, the crew famous that the abundance of the succinylated proteins within the host was considerably upregulated at 24 hpi, regardless that the abundance of whole proteins revealed no outstanding variation. This indicated that protein succinylation represented an important host response in opposition to COVID-19.

Detection of the interpretation patterns confirmed that many of the viral transcripts have been considerably upregulated within the early phases of the an infection. With respect to viral abundance, the crew noticed that solely 4 proteins, specifically SARS-CoV-2 membrane glycoprotein (M), nucleocapsid (N), open studying body 3 (ORF3), and spike protein (S) have been at detectable ranges at 24 hpi. These outcomes have been in step with the SARS-CoV-2 life cycle in contaminated cells.

Moreover, the crew discovered that the modification in succinylation occurred in solely the N and M proteins at 24 hpi. However, each N and M proteins have been in excessive abundance at 12 hpi whereas succinyl modification was not detected at this level, indicating that succinylation of the N and M proteins occurred solely after protein translation within the viral replication course of. The crew additionally noticed that the succinylated websites situated within the M protein have been conserved in all of the SARS-like coronaviruses. This recommended that SARS-CoV-2 protein PTMs reminiscent of succinylation have a regulatory function within the technique of viral replication.    

The researchers acknowledged that 1000 succinylated host proteins detected at 24 hpi in addition to 246 proteins have been differentially expressed. Furthermore, enrichment evaluation revealed that the succinylated host proteins that displayed upregulation have been additionally concerned within the pathways related to proteasome, ribosome, and spliceosome metabolism, whereas the down-regulated proteins have been related to systemic lupus erythematosus, neutrophil extracellular entice formation, alcoholism, and viral carcinogenesis.  

Evaluation of succinylation inhibitors confirmed that ST1326, an inhibitor of carnitine palmitoyltransferase I (CPT1), displayed antiviral exercise in Caco-2 cells in addition to HEK293T-angiotensin-converting enzyme-2 (ACE-2) cells. The adenosine monophosphate-activated protein kinase (AMPK) inhibitor STO-609 additionally exhibited antiviral exercise in Caco-2 cells however a relatively decrease antiviral exercise in HEK293T-ACE2 cells.


Total, the examine findings confirmed that international succinylproteomics evaluation might precisely reveal the influence of SARS-CoV-2 an infection and viral protein succinylation modification on metabolic processes within the host cells.

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